1255121553 has 8 divisors (see below), whose sum is σ = 1912566208. Its totient is φ = 717212304.

The previous prime is 1255121531. The next prime is 1255121587. The reversal of 1255121553 is 3551215521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1255121553 - 2⁸ = 1255121297 is a prime.

It is a super-3 number, since 3×1255121553³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1255121553.

It is not an unprimeable number, because it can be changed into a prime (1255121953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29883826 + ... + 29883867.

It is an arithmetic number, because the mean of its divisors is an integer number (239070776).

Almost surely, 2^1255121553 is an apocalyptic number.

It is an amenable number.

1255121553 is a deficient number, since it is larger than the sum of its proper divisors (657444655).

1255121553 is an equidigital number, since it uses as much as digits as its factorization.

1255121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59767703.

The product of its digits is 7500, while the sum is 30.

The square root of 1255121553 is about 35427.6947175511. The cubic root of 1255121553 is about 1078.6865471401.

The spelling of 1255121553 in words is "one billion, two hundred fifty-five million, one hundred twenty-one thousand, five hundred fifty-three".